When taking surveys of populations it's always best to have as large of a survey base as possible. For example, if you are trying to find what the most popular names in the US are, you will get far more accurate data with a survey pool as large as the US census then just asking random people walking thru Chicago or just people staying in hotels or an even smaller pool, just people in the lobbies in Chicago hotels.
Here, taken from
the 1990 US Census Bureau, are the fifty most common
surnames, plus the 25 most common male and female names, for people
living in the United States in 1990:

50 Most Common American Surnames
(US Census 1990)

1.
Smith

11.
Anderson

21.
Clark

31.
Wright

41.
Mitchell

2.
Johnson

12.
Thomas

22.
Rodriguez

32.
Lopez

42.
Perez

3.
Williams

13.
Jackson

23.
Lewis

33.
Hill

43.
Roberts

4.
Jones

14.
White

24.
Lee

34.
Scott

44.
Turner

5.
Brown

15.
Harris

25.
Walker

35.
Green

45.
Phillips

6.
Davis

16.
Martin

26.
Hall

36.
Adams

46.
Campbell

7.
Miller

17.
Thompson

27.
Allen

37.
Baker

47.
Parker

8.
Wilson

18.
Garcia

28.
Young

38.
Gonzalez

48.
Evans

9.
Moore

19.
Martinez

29.
Hernandez

39.
Nelson

49.
Edwards

10.
Taylor

20.
Robinson

30.
King

40.
Carter

50.
Collins

25 Most Popular American Male
Names
25 Most Popular American Female Names